Adjusting device for cylinder grinders



June 30, 1931. F. M. KERN 1;s11,943

ADJUSTING DEVICE FOR CYLINDER GRINDERS Original Filed Jan. 31, 1928 2 Sheets-Sheet 1 June 30, 1931; F, M KERN 1,811,943

ADJUSTING DEVICE FOR CYLINDER GRINDERS Original Filed Jan. 51, 1928 2 Sheets-Sheet 2 Patented June 30, 1931 UNITED STATES PATENT OFFICE FRED M. KERN, or DETlRbIT, MIcHIGAN, AssIGNon. 'ro HUT'I'O ENGINEERING com- PANY, INo., or Dnrnorr, MICHIGAN, A CORPORATION or MICHIGAN ADJUSTING DEVICE FOR CYLINDER GItINDERS Application filed January 31, 1928, Serial No. 250,889. Renewed November 22, 1929.

This invention relates to a grinding device which is more particularly designed for grinding the bore of cylinders, such as the cylinders of gas engines. 'When grinder deavoiding loss of time and reduced output of the machine which otherwisewould necessarily occur. 1 In the accompanying drawings Figure 1 is a longitudinal section of an approved form of grinding device embodying this invention.

Figure 2 is a side'elevation of the same.

Figure 3 is a cross-section on line 33 Fig. 1.

Figure 4 is a fragmentary view, partly in section, of the upper part of the grinding device showing the suitable way of driving the same.

Figure 5 is a fragmentary vertical section taken on line 5-5 Fig. 4.

In the following description, similar reference numerals indicate like parts in the several figures of the drawings.

The numeral 10 'representsvthe supporting head or body of the grinding device which in the particular construction shown in the drawings is provided with a longitudinal cylindrical bore 11 of comparatively small diameter and an upwardly extending coupling or guide section 12 provided with an internal cylindrical bore 13 which is of larger diameter than the, bore 11 and forms an upwardly facing shoulder 14 between the bores 11 and 13, and a plurality of pairs of transverse guide openings 15, each of which extends from the longitudinal bore 11 to the periphery of the head, and the members 0 each pair being arranged lengthwise in line with each other.

Arranged in an annular row around the periphery of the body or head are a plurality of abrasive members 16, the outer surfaces of which are adapted to engage with the bore of the cylinder or other article which is to be ground, which abrasive members are preferably constructed of carborundum although any other suitable material may be used for this purpose. These abrasive members may vary in number, six being shown in Fig. 3 as an example, and these several abrasive members are adjustably mounted upon the supporting head or body so that the same can be shifted radially or laterally on this head in order to increase or decrease the diameter or size of the grinding device, for adapting the same to aparticular size of cylinder surface and also to take up the wear on the surfaeas well as on the abrasive memhers as the grinding operation progresses.

Although the means for adjusting the abrasive members radially on the supporting head may vary, the particular means shown in the drawings have been found satisfactory in practice and as there shown the same, are

constructed as follows The numeral 17 represents a plurality of abrasive holders each of which is arranged lengthwise along the outside of the supporting head and has one of the abrasive mem bers 16 mounted on its outer side in any approved manner. Each of these holders 17 is mounted on the outer ends of two guide pins -18, 18 which are arranged lengthwise in line and each of which projects inwardly from the respective holder through one of the transverse guide openings 15 in the supporting body. The inner ends of the corresponding guide pins 18 on the upper ends of the several holders engage with the conical periphery 19 of an upper cone 20, which latter is provided with an upper cylindrical part 21 which slidingly engages with the upper. part of the'cylindrical bore 11 in the supporting head,and the corresponding guide pins 18 at the lower ends of the several abrasive supporting holders 17 engage with the conicalv surface 22 of a lower com 38, which latter slidingly engages-its cylindricalsurface 24 with the lower part of the bore of the supporting head.

These guide pins 18 are preferably yieldingly held in engagement with the conical surfaces of these cones by spring means which in the present instance consists of a i i plurality of two-armed wire springs each of which has its central part secured to the outer,

side of the supporting head by means of a clamping screw 26 while itsends engage with openings 27 in the guide pins 18 of one of the abrasive holders or carriers 17, as. best shown in Fig. 1.

The two cones 20and 23 oppose each other and are capable of longitudinal adjustment relatively to each other for the purpose of pushing the guide pins 18' laterally outwardly more or less, and thereby changing unthreaded part 31 engages with a longitudinal cylindrical opening 32 in the upper cone 20 and an enlarged collar 33 at the upper end of this adjusting screw bears with its lower or inner side against an upwardly facing internal shoulder formed by a counter bore 35 in the upper end of the upper cone 20.

By turning this adjusting screw in one direction the two cones 20 and 23 are drawn together lengthwise of the supporting head whereby the abrasive members are expanded as a group or set for increasing the diameter of the tool, and upon turning this adjusting screw in the opposite direction, the cones are moved away from each other lengthwise of the supporting head thereby presenting those parts of the cone which are of smaller diameter to the guide pins 18 so that the latter can be moved inwardly a corresponding extent under the action of the springs 25 and thereby reduce the diameter of the tool. The spreading of the cones 20 and 23 upon turning the screw 28 backwardly is preferably effected by a spring 36 which surrounds the adjusting screw 28 and bears at its opposite ends against the inner small ends of the adjusting cones, as shown in Fig. 1.

In order to prevent the lower cone 23 from turning and still permit the same to move lengthwise while this adjustment is being effected, detent means are provided which preferably consist of alongitudinal groove 50 formed on the periphery of the cone 23 and a spline or pin 51 mountedion the adjacent lower part-of the supporting head and engaging with this groove, as shown in Fig. 1.

- The. supporting head maybe rotated in any suitable manner for the purpose of grinding the surfaces with which the abrasive members 16 are engaged, but it is preferable to employ for this purpose a longitudinal driving spindle 37, the upper end of which is provided with a tang 38 for connection with a suitable power driving device such as an electric motor or with a crank or similar instrument whereby the same may be rotated manually. At its lower end this driving spindle is detachably connected with the grinding device by means which referably permit of readily attaching the grinding device to and detaching the same from the spindle. As shown, this coupling device preferably consists of a spherical or bore shaped hub 39 arranged on the lower end of the driving spindle and arranged in the upper enlarged bore 13 of the head extension 12, and two coupling or driving pins 40 projecting from diametrically opposite sides of the hub 39 and engaging their upper sides with undercut seats 41 of bayonet slots 42 formed in the upper end of the body extension 12, as best shown in Figs. 4 and 5. When the tool is in operation the same is turned by the spindle 37 in the direction in which the coupling pins 40 engage with the closed ends of'the bayonet slots 42, thereby causing the tool to turn with this spindle. For the purpose of uncoupling this tool from the driving spindle 37 the head 10 is raised slightly together with its extension 12 and then turned forwardly independently of the driving spindle so as to disengage the same from the undercut portion of the bayonet joint, andthen the tool is moved lengthwise away from the spindle so that the coupling pins 40 can move out I through net slots.

Means are provided which permit of turning the adjusting screw 28 for the purpose of varying the working diameter of the tool Without necessitating uncoupling of the grinding device from the driving spindle 37 which adjusting means permit of turning the adjusting screw from the exterior of the supporting body or head and in their preferred form are constructed as follows:-

The numeral 43-represents a shank extending upwardly from the upper end of the adjusting screw 28 into the upper enlarged bore 13 of the head extension 12, and 44 is an adjusting disk which turns in said bore 13 and rests with the marginal part of its underside against the outwardly facing shoulder 14 and is provided with a central opening 45 which receives the shank 43 of the adjusting screw. This adjusting disk is free to turn circumferentially about the axis of the supporting head and adjusting screw, but is held against longitudinal movement, this being preferably eflected by means of two retaining pins 46 arranged on diametrically opposite sides of the supporting head and engaging with an annular gr ove 47 in the periphery of the adjusting disk as shown in Fig. 1. This adjust the longitudinal parts of the bayo lit) " ing sleeve 52 whic vided with a lurality of adjusting'teeth 48- which are pre erably arranged in an annular row, and on the adjacent part of the head extension 12 the latter is provided with a circumferential slot.49.

Surrounding the cylindrical guide extension 12 of the supporting body 1s an adjustis fitted on the periphery of this portion of the head so as to be capable of both a limited longitudinal and rotary movement relatively thereto; by means of an adjusting or shitting pin 53 secured to the .lower part of thls sleeve and projecting inwardly through the slot 49 andadapted to engage with one or another of the shifting pins 8 on the adjusting disk 44. 4

. When it is desired to turn the adjusting screw for the purpose of increasing or decreasing the working diameter of the grinding device, the adjusting sleeve '52 is raised until its adjusting pin 53 engages with the upper side ofthe slot 49 at which time this pm is out of engagement with the adjustin teeth 48. The sleeve 52v can now be turned either. forwardly or baclgwardlyon the head extension 12, a distance equal to the length of the slot 49 and then the sleeve may be again suit the predetermined e ansion or contraction of the tool which is esired. Obviously an oscillating movement in which the efi'ective steps of the same are in one direction of the ad usting sleeve as it is successively' cou led with difierent teeth of the adjusting dis will cause the adjusting cones to ap{ proach each other and expand the group of abrasive members for producing grinding of an increased diameter while an oscillating movement of this sleeve in which the efi'ectives'te s are reversed and'the adjusting disk toget er with the adjustin screw are turned in the opposite direction will cause the cones to recede from each other and thereby permit the abrasive members to contract so that the tool as a whole is of smaller diameter.

These means for adjustin the tool are very sim le, and it possible to adjust the diameter of t e abrasive surfaces withoutdetaching the inding device from the driving spindle but t ey permit of efiectin such ad ustment with ease and facility and without any material interruption in the operation of the machine. Nor

the diameter of 7 hot onl render does the same contain any smallor' delicate parts which are liable to get out of order,".

which otherwise would necessitate frequent repairs as well as increasing the cost of the work which is done by the tool.

Moreover this adjusting device is very compact and will In; interfere with the operationof the grinding device'nor obscure the view of the operator while observing the progress of the work which is being done by the grinding' device on the bore oithe cylinder, and thereby enabling him to efiect the grindmg lowered and engaged behindone or other of operation accurately and thoroughly.

-the several teeth 48 of the adjusting disk, and

' wise of the supporting head and the diameter of. the tool changed accordingly. As shown in the drawings the full rotary stroke of the adjusting sleeve which is permitted bythe slot '49 upon turning the sleeve in either direction isequal to two and one-half teeth. on the adjusting disk, the length of the stroke being governed by the length of [the slot 49, but the length ofeach adjusting stroke of the sleeve may be shortened by stopping the rotation of the same before the adjusting pin 53 reaches either end of the. slot 49. It is thus possible upon calibre-tin the instrument to from a predeterminedcrotary' movement of adjusting screw connecting said cones; a pm ralitypof abrasive supports engaging with said cones; and means for rotating said adtatable within the supporting head but held against longitudinal movementand rotatable with said adjusting screw but incapable of moving lengthwise therewith and provided with an annular row of teeth; and an adjust- 'llg sleeve surrounding said head and capable o rota and longitudinal movement and.

justing screw including an adjusting disk 1:0-

provide with an inwardly projecting shiftmg pin adapted to be engaged with difierent teeth of said disk for turning the same and slid screw. e I

comprising a sup-v piorting grinding device ead provided at one end with a cyndrical bore and-an openin in it; side; op-.

posed con w movable lengthwise in said head an adjusting screw havmg a screw connection with one arena cones'and a shoulder the adjustingdisk and thereby enable the opbearing against the other cone and-provided longitudinal sliding movement thereon and provided with a shifting pin projecting inwardly through said opening in the head and adapted to be engaged with one or another of the teeth of said shifting, pins and couple said disk with said sleeve. I

3. A grinding device comprising a supporting head provided at one end with a cylindrical bore and an opening in its side; op-

posed cones movable lengthwise. in said head,

an adjusting screw havinga screw connection with one of said conesfand a shoulder bearing againstthe other cone and provided with a flat sided shank; a plurality of abrasive supports engaging with said cones; and means for rotating said screw including an adjusting disk rotatable within the head but held agalnst longitudinal movement and provided centrally with. a flat sided opening which receives said shank and with a pe-. ripheral row of teeth; and an adjusting sleeve surrounding said head and having a pin projecting inwardly through said opening in the head and into engagement with {mg( or another of said teeth of the adjusting dis 4. A grinding device comprising a supporting head; opposed cones movable lengthwise on said head; a longitudinally movable adjusting screw connecting said cones; a plurality of abrasive supports engaging with said cones; and means for rotating said adjusting screw including an adjusting disk arranged within the head and capable of turning with said screw but incapable of movinglengthwise therewithand provided with a periph- 'eral groove and an annular row. of teeth around the axis thereof; a retaining pin arranged on the head and projecting into said groove; and an adjusting sleeve surrounding said head and capable. of rotary and longitudinal movement thereon and provided with an inwardly projecting pin adapted to engage with one or another of said teeth.

5. A grinding device comprising a supporting head; supports for abrasive members mounted on said head and movable radially thereon; and means for adjusting said supports radially on the head, including opposed cones movable lengthwise of the head and en-- gaging said supports; an adjusting screw connecting said cones; a tubular guide associafied with said head; a rotary member arane-4s ranged within said uide and coupled with said screw and capa le of turning but held against longitudinalmovement and provided with an annular row of teeth; and an adjusting sleeve surrounding said guide and capable of rotary and longitudinal movement thereon and provided with a pin adapted to the exterior of said supporting means and movable lengthwise relative thereto and having a projection adapted to engage with one or another of said teeth of the adjusting disk.

7. A grinding device comprising rotatable supporting means; abrasive carriers mounted on said supporting means and movable toward and from the axis thereof; and adjusting means for moving said abrasive carriers relative to the axis of said support ing means including cam means engaging said abrasive carriers; an adjusting screw for shifting said cam means; an adjusting disk rotatable within said supporting means and compelled to turn therewith but incapable of moving lengthwise and provided with an annular row of teeth; and an adjusting sleeve rotatable on the exterior of said supporting means and movable lengthwise thereof and having a projection adapted to be engaged with one or another of said teeth of the adjusting disk.

In testimony whereof I, hereby afiix my 

